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A safe implementation of the transactional outbox pattern for Java (core library)

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package com.gruelbox.transactionoutbox;

import java.time.Instant;
import java.util.Collection;
import java.util.List;
import lombok.Builder;

/** Stub implementation of {@link Persistor}. */
@Builder
public class StubPersistor implements Persistor {

  StubPersistor() {}

  @Override
  public void migrate(TransactionManager transactionManager) {
    // No-op
  }

  @Override
  public void save(Transaction tx, TransactionOutboxEntry entry) {
    // No-op
  }

  @Override
  public void delete(Transaction tx, TransactionOutboxEntry entry) {
    // No-op
  }

  @Override
  public void update(Transaction tx, TransactionOutboxEntry entry) {
    // No-op
  }

  @Override
  public boolean lock(Transaction tx, TransactionOutboxEntry entry) {
    return true;
  }

  @Override
  public boolean unblock(Transaction tx, String entryId) {
    return true;
  }

  @Override
  public List selectBatch(Transaction tx, int batchSize, Instant now) {
    return List.of();
  }

  @Override
  public Collection selectNextInTopics(
      Transaction tx, int flushBatchSize, Instant now) {
    return List.of();
  }

  @Override
  public int deleteProcessedAndExpired(Transaction tx, int batchSize, Instant now) {
    return 0;
  }

  @Override
  public void clear(Transaction tx) {}

  @Override
  public boolean checkConnection(Transaction tx) {
    return true;
  }
}